Why is the weather in Qingshui Bay adjacent to Sanya cold in winter?

Sanya and the adjacent Qingshui Bay are not in the same climate zone, so the weather in Qingshui Bay will be cold in winter. According to relevant public information, Sanya has a tropical maritime monsoon climate zone, which is warm all year round. Qingshui Bay has a continental monsoon climate, with cold winters and hot summers. Therefore, the weather in Qingshui Bay adjacent to Sanya will be cold in winter.